Tag Archives: mtm

For reasons that are not particularly clear, the Toronto.ca|Open data is in two different coordinate reference systems (CRS), MTM 3 Degree Zone 10, NAD27 (EPSG 2019) and UTM 6 Degree Zone 17N NAD27 (EPSG 26717). This confuses QGIS even if you’ve input the proper SRIDs into SpatiaLite. The image above shows two apparent Torontos, one in each of the CRSs.

What you have to do is go to to the Project Properties, select the Coordinate Reference System (CRS) tab, and “Enable ‘on the fly’ CRS transformation”. This will line those city layers right back up.

Once we do that, things align as they should. Here’s my neighbourhood, with its parks

The OGR Simple Feature Library is your friend. It can convert pretty much any geo format to another, and can transform coordinates between systems. In exchange for this power, it wants your soul is rather complex.